Front Air Suspension Strut 2213200538 | Mercedes-Benz S-Class W221 4MATIC Air Shock Absorber with Electronic Sensor Our front air suspension strut OE 2213200538 is high-quality aftermarket replacement air shock absorber designed exclusively for Mercedes-Benz S-Class W221 4MATIC chassis. This integrated assembly consists of hydraulic damper, multi-layer reinforced air spring bellow, protective dust boot, aluminum air cylinder and built-in electronic sensor. It can seamlessly